Because, outside of Sonic, Sega's treated me pretty damned well over the years?
Has the company had some ups and downs? Absolutely, what company hasn't. But compared to some of the other big names on the market, it's ups and downs haven't been as extreme (Sonic notwithstanding, but that's something else entirely). In the grand scheme of things, having something as inconsequential as cosmetics being one of the "biggest" issues with PSO2 is pretty damned low on the totem poll (and no, sorry kids, the install isn't a Sega issue, it's a Windows Store issue, blame Microsoft, not Sega on that one).
You really have to look at the grand scheme of things when it comes to how Sega's operating. As others have said, their main market has always been in the east, they've never really seen the western audiences as that huge of a market until recently, when they're taking some fairly significant risks to bring over IPs that, traditionally, have not done super well over here. I love Phantasy Star, it's one of my favorite JRPG series, but I'm not going to sit here and lie about it gaining the same steam and traction as Final Fantasy did. On that same page, it took Dragon Quest decades to finally get the recognition it deserved as well, all because it too was living in the shadow of a series that has progressively become less about the video game aspect, and more about the pretty pictures and graphics, so is it really all that surprising that the Phantasy Star IP was more or less abandoned in the west? Dragon Quest nearly was as well, and if not for the risk SE took to revitalize it on the DS with the trio of remakes, chances are we probably would have stopped getting games localized in the series after VIII.
But developers are starting to take leaps of faith into the west to revitalize old franchises, and Sega's one of them. Considering we're getting the entirity of PSO2's content before NG next year, to say nothing about New Genesis being a world wide, global launch of a new Phantasy Star game - something I never thought I'd ever be able to see or say again - is pretty telling that Sega is making some pretty signfiicant strides to try to open up their markets back to the west.
As others have said as well, revitalizing old franchises like Streets of Rage, Alex Kidd, and ESPECIALLY Panzer Dragoon, as well as releasing the phenomenal Sega Genesis Mini, all shows that Sega is definitely trying to get back to how they used to be. Just because one franchise in Sega's arsenal is going down the crapper doesn't mean that the rest are, and let's also not pretend what's happening to Sonic isn't also happening to Mario, or are we going to sit here and say with a straight face that Orgami King is a good game?
As a whole Sega does have more work to go, but over the past two years they've shown significant improvement in both handling their western releases of games, as well as treating their old IPs with the respect they deserve. So yes, I have faith in Sega continuing to keep on the path they're on, because as of right now, they're showing me no reason to believe otherwise.